Used primarily as an intermediate in the synthesis of pharmaceuticals and fine chemicals. Its aldehyde and carboxylic acid functional groups allow for versatile chemical transformations, making it valuable in constructing complex organic molecules. Commonly employed in the development of active pharmaceutical ingredients (APIs), especially in routes requiring chain elongation or ring formation through condensation or cyclization reactions. Also utilized in the preparation of specialty polymers and agrochemicals where specific aromatic substitution patterns are required. Its reactivity profile supports use in multi-step organic syntheses, particularly in research and development settings.